Yes, you can shave as usual.
Yes, it is safe to take a bath or shower, but be careful not to swallow any water. Use caution when bathing babies and young children. Consider giving them a sponge bath to reduce the chance they might swallow water.
No. Use boiled, bottled, or disinfected water to brush your teeth.
It is safe to wash clothes in tap water while under a boil water advisory or order.